James garner



(No Model.)

Patented July 19,1892.

aka- U gig-H ,azvwu-v QRgM/W 4. I z I UNITED STATES PATENT OFFICE.

JAMES GARNER, THOMAS COCKERILL, AND CHRISTOPHER PORRETT, OF MANCHESTER,ENGLAND.

HOIST.

SPECIFICATION forming part of Letters Patent No. 479.087, dated July 19,1892.

Application filed February 23, 1892. Serial No. 422,561. (No model.)Patented in England October 5, 1891, No. 16,877.

To all whom it may concern.-

Be it known that we, JAMES GARNER, THOMAS OooKERILL, and CHRISTOPHERPon- RETT, citizens of the United Kingdom of Great Britain and Ireland,residing at Manchester, in the county of Lancaster, England, have i11-vented certain new and usefulImprovements in Hoists, (for' which LettersPatent were granted in Great Britain October 5, 1891,No. 16,877,) ofwhich the following is a specification.

This invention relates to hoists; and its objects are to prevent theaccidents which now frequently arise through the insecurity of thefastenings of the landing-doors and through their being negligently leftopen and to secure the automatic opening, closing, and locking of thedoor.

We will describe our said invention with reference to the accompanyingdrawings, in which- Figure 1 represents a transverse section through thehoist and door; Fig. 2, an elevation showing the inside of the door intwo positions; Fig. 3, a vertical section through the hoist, showing thedoor in the raised position; Fig. 4, an elevation similar to Fig. 2 ofthe door at the bottom landing; Fig. 5, a similar View to that shown byFig. 4, but with the door partly lifted; and Fig. 6, a transversesection of the hoist at the bottom landing, showing the method oflifting the door.

According to the improvements a rocking shaft A is arranged within orupon the cage of the hoist. is fixed anarm B, carrying a guide-bowl Oand a second arm D, by means of which the door may be lifted, and whichmay also be employed to disengage the door-locking device. There mayalso be fixed to the rocking shaft A a handle Z and one or two hooks orhooked arms E, the function of the handle being to put the apparatus outof action when passing the door at any landing at which the cage is notrequired to stop. The hook or hooks or hooked arms E are employed forlifting andclosing the door F at the bottom landing. Above thelanding-doors there is arranged an inclined plane or swell G in such aposition that the guide-bowl O on one of the arms attached to therocking shaft will travel over Upon this rocking shaft there and bemoved by it. This motion is communicated to the rocking shaft by the armB and from the rocking shaft to the door-lifting and disengaging arm D.

On the inner side of each door there is fulcrumed a bent or bell-cranklever H, one part of which I is in the path of the lifting-arm D. Theopposite end of this lever is formed as a catch J to engage with a fixedprojection K on the door-jamb or hoist-framing, thus forming alockingdevice which cannot be actuated or interfered with from theoutside. It will be understood that each of the doors slides upward .anddownward in suitable grooves or guides to close and open the entrance tothe cage and that it is incapable of any other motion. As the cage Lascends the lifting-arm D comes into contact with the part I of the bentlever H, and by its continued motion it disengages the catch J from thefixed projection K.

By reference to Figs. 2 and 3 it will be seen that the motion of thebent lever II is limited by the staple or bridge-piece M, which isfirmly secured to the door. The continued motion of the cage thereforepresses the bent lever against the upper part of the bridge-piece, andas its free motion therein is thus arrested the door is lifted into theposition indicated by dotted lines in Fig. 2.

Instead of the arrangement for lifting the door illustrated by thedrawings, the arm D, after liberating the locking device, may be causedto engage with a fixed projection on the door, either directly or withthe bent lever intervening. \Vhen the door has been lifted to asufficient height, the arm D may be disengaged by means of theguide-roller O, traveling over a swell or incline, such as G, Figs. 1and 3. This swell is preferably fixed at such a height above the landingthat the door is not disengaged until the cage commences to move awayfrom the landing. If the motion of the cage should be downward from thelanding, the door naturally falls with the descent of the arm D; but ifits motion is upward, the arms B and D being rigidly connected, thetravel of the guide-roller on the arm B over the swell naturally causesthe simultaneous displacement of the arm D, thereby liberating the door,which then falls by its own weight into the closed position, whereuponthe catch J engages with the projection K and the door becomes lockedautomatically. India rubber or spring buffers may be employed to deadenthe shock of the falling door or it may be partly counterweighted.Should the cage be required to stop at any landing in its descent, itmust be lowered below the landing and then be caused IO to reascend, asthe apparatus is constructed to liberate and lift the door in the upwardmotion only; or, if preferred, a modification of the arrangementhereinafter described with reference to the door of the bottom landingmay be adapted to each landing where the door may frequently be desiredto be opened and closed and locked automatically during the descent ofthe cage. Since the cage cannot generally descend below the bottomlanding, so as to actuate the apparatus in its as cent thereto, ashereinbefore described, the rope N may be employed for lifting the door,as illustrated by Figs. 4, 5, and 6. One end of this rope is lined orattached to the door at O. Thence it passes overthe pulley 1", acrossthe hoist-well to the second similar pulley, and thence downward againto the door, to which it is secured by attaching the end to the lever Q,to which the bent lever 11, carry ing the catch J, is connected throughthe link R. \Vhcn the hoist approaches the door F, the arm Brides in toa cam-recess G and rocks the shaft, so that the hook or hooked arm Eengages with the rope and pulls it downward, as shown by Figs. 5 and 6.This pull upon the rope first lifts the latch 0r lever Q, thusliberating the catch J. The lever Q then comes into contact with thebridge-piece and its free motion is stopped; but the pull upon the ropebeing still exerted by the continued descent of the cage it follows thatthe door must now be lifted, and it accordingly moves upward until thecage is stopped. The door is held in the open position so long as the 5cage remains at the bottom of the hoist; but immediately upon its ascentit is closed and automatically locked by the reversal of the motion.Instead of one hook or hooked arm, as illustrated by the drawings, twomay be employed, in which case it is preferred to arrange them so as toengage with the rope near to the pulleys 1 1; also, instead of aseparate hook or hooks or hooked arms the hook may be formed by suitablybending the arm I).

Having now particularly described and ascertained the nature of our saidinvention and in what manner the same is to be performed, we declarethat what we claim is 1. The combination and arrangement, in a hoisthaving vertically-sliding doors, with a locking device consisting of abent lover, a catch, and a fixed projection, of a rocking shaft mountedin the cage and having socured thereon an arm arranged to trip saidlever and raise the door, substantially as hereinbefore described, andas illustrated by the accompanying drawings.

52. The combination and arrangement, in a hoist havingvertically-sliding doors, of a door-locking device consisting of a bentlever, a catch, and a fixed projection, with a rocking shaft having thearm B and the hook E secured thereon, a cam-surface to engage the arml3, and the rope N, adapted to be engaged by the hook E and to liberatethe locking device and lift the door, substantially as hereinheforedescribed, and as illustrated by the accompanying drawings.

3. The combination, in a hoist having vertically-sliding doors, of adoor-locking device consisting of a bent lever and catch pivoted on thedoor and a fixed projection on the door-casing, a rocking shaft mountedin the cage, an arm on said rock-shaft arranged to trip the lever andlift the door, a second arm arranged to travel in proximity to theframework, and a cam-surface on said framework lying in the path of saidsecond arm, substantially as described.

4. The combination, in a hoist, of a vertically-sliding door havingpivoted thereon the lever II and latch Q, the link R, connecting saidparts, the bridge M, spanning the latch, the rope N, attached at one endto the door and at the other end to the latch and running over pulleysP, and a cage having a rockshatt mounted thereon carrying a hooked armto engage with said rope, substantially as described.

5. In a hoist, the combination, with vertically-sliding doors havingpivoted catches and devices whereby they may be operated, of a cagehaving the rock-shaft A, mounted therein, carrying the arms 13, l), andE, and a handle Z, and cam-surfaces on the framework to engage the arm Band cause the arms 1) E to operate the catches, substantially asdescribed.

In testimony that we claim the foregoing our invention we have signedour names, in presence of two witnesses, this 20th day of January, 1892.

JAMES GARNER. THOMAS COCKERILL. CHRISTOPHER IORRET' Witnesses:

WILLIAM E. lIEYs, GEO. W. Rown.

